NASA is beginning work on a new satellite mission that will extend critical climate measurements of Earth's oceans and atmosphere and advance studies of the impact of environmental changes on ocean health, fisheries and the carbon cycle. Tentatively scheduled to launch in 2022, the Pre-Aerosol Clouds and ocean Ecosystem (PACE) mission will study Earth's aquatic ecology and chemistry, and address the uncertainty in our understanding of how clouds and small airborne particles called aerosols affect Earth's climate. [Source: NASA]